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17 Cards in this Set
- Front
- Back
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triploblast |
organism with tissue derived from 3 separate embryonic tissue layers |
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ectoderm |
embryonic tissue layer that forms the external epidermis |
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mesoderm |
embryonic tissue layer that forms internal organs or structures |
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endoderm |
embryonic tissue layer that develops into the epidermis of the gut |
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parenchyma |
loosely packed cells that fill the volume of platyhelminthes body |
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acoelomate |
organism without a fluid-filled enclosed body cavity |
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Class Turbellaria |
free-living platyhelminths (all others parasitic) |
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Order Polycladida |
large marine flatworms, frequently mimic nudibranchs |
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Order Tricladida |
includes planarian flatworms |
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protrusible pharynx |
feeding structure in mouth used to pick up food |
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pharyngeal cavity |
area pharynx withdraws to when not protruded |
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incomplete gut |
gut with only one opening |
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ocelli |
light-sensitive cells, usually cup pigment eyes |
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circumferential muscle |
muscle running around circumference of the body |
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longitudinal muscle |
muscle running length of the body |
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gland cells |
cells that secrete mucous for prey capture |
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ventral nerve cords |
pair of nerve cords running up the ventral side of the body |
